oottrell



(No Model.) 2 Sheets-Sheet 1.

0. B. OOTTRELL. CYLINDER PRINTING MACHINE. No. 333,392. Patented Mar.23,1333.

N. PETERS. Pnuxwmm n her, Washingiun. 11c

(No Model.) I 2 Sheets-Sheet 2.

0. B. (JOTTRELL. CYLINDER PRINTING MACHINE.

Patented Mar.- 23, 1886.

Ill/IIIIl/II/ll/l/I lllllllll Wifrzeaveaher. Washington, 116.

UNITED STATES PATENT @rricn.

CYLINDER PRINTING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 338,392. dated March23, 1886.

Application tiled August 1'7, 1885. Serial No. 174,534. (No model.)

To all whom, it may concern: I

Be it known that I, CALVERT B. COTTRELL, of Stonington, in the county ofNew London and State of Connecticut, have invented a new and usefulImprovement in Cylinder Printing- Machines, of which the following is aspecification.

My invention relates to two -revolution presses in which the imiiression-cylinder is raised during the return movement of the bed, inorder to avoid making contact with the form thereon. ln presses of thisclass the cylinder-boxes have been connected by rods with a crosshead orslide on each side thereof. Springs have been arranged below thecrosshead or slide, and said cross-head or slide has been connected bytoggle-levers with the pressframe in such manner that when the leversare deflected or swung out of line the springs may force the cross'heador slides and the cyl inder-boXes connected with them upward, and solift the cylinder that the form may return without making contacttherewith. These togglelevers have been connected with a rockshaftextending transversely across the press, and the rock-shaft has beenoperated by a cam-actuated rod or bar having a notch or gabhook, whichengages a wrist-pin on an arm depending from the aforesaid rock-shaft.By the action of the canractuated rod or bar the toggle-levers arealternately deflected out of line to permit of the cylinder being raisedand straightened,or brought into line, so as to draw the cylinderdownward. XVhen it is desired to leave the cylinder temporarily in itsraised or elevated position, so that the bed may travel backward andforward without the form coming in contact with the cylinder, theaforesaid rod or bar is lifted, so that its gab-hook or notch is out ofengagement with the wrist-pin on the rock-shaft arm. In case, however,of the gab-hook or notch being raised from the wrist-pin when the leversare straightened or in line, breakage of parts of the press might ensue,and the object of my invention is to insure the deflection or bendingout of line of the toggle-levers, even if the gab-hook or notch belifted off the wrist-pin at a time when said levers are straightened orin line.

To this end my invention consists in the combination,with animpression-cylinder,and mechanism, substantially such as described,

tion or abutment, by striking against the wristpin as the rod or bar ismoved whilein its elevated position, will deflect the togglelevers outof line and avoid any possibility of leaving the cylinderin itslowermost position with the togglelevers in line.

In the accompanying drawings, Figure l is a side view of portions of apress embodying my invention. Fig. 2 is a transverse sect-ion upon theplane of the dotted line a: 00, Fig. 1;

and Fig. 3 is a vertical longitudinal section upon the plane of thedotted line 3/ 7 Fig. 2.

Similar letters of reference designate corresponding parts in all thefigures' A designates the base-frame of the press,

and A the side frames thereof. In these side frames are fittedcylinder-boxes ct, which may be raised or lowered in vertical guidewaysa in the side frames, and which support the journals of theimpressioncylinder B.

In the lower part of the side frames, A, are slideways or guides w, towhich are fitted crossheads or slides C, and said crossheads or slidesare connected by rods C with the cylinderboxes a. The lower end portionsof the rods C are screw-tlircaded, and to them are applied nuts I), theperipheries of which form spur-pinions, and between these pinions is anintermediate pinion, Z), gearing withthem. By turning the intermediatepinion, b, the gearnuts 1) upon the rods will be turned simultaneouslyand equally, and by them the distance between the cylinder boxes and thecross heads may be definitely fixed, the rods being provided with othernuts, Zr, above the cross-heads. The rods C are prolonged downward belowthe cross-heads C, and have applied to them springs I), the tension ofwhich may be adjusted by nuts 5. The cross-heads or slides C are, bymeans of toggle levers or links D D, connected with the side frames, A,above the cross heads or slides.

a designates the middle joint of the toggleeating movement of the bed.

levers, and c c designate, respectively, the l upper and lower pivotalpoints thereof.

From the above description it will be understood that when the togglelevers or links D D are straightened or brought into line with eachother they form a strut which draws and holds the cylinder downward intoits lowermost position, so that it will make contact with the form onthe reciprocating bed. (Not here shown.) WVhemhowever, the toggle leversor links D D are bent or deflected out of line, as shown in Figs. 1 and3, the springs b will raise the cross-heads or slides U, and throughtheir rods 0 will raise the cylinder, so that it will not make contactwith the form on the reciprocating bed.

I have not here shown the bed, as it and its operating mechanism form nopart of my invention. They may be of any suitable or or dinarycharacter. The lower pivotal centers, 0, of the toggle-levers or linksare formed by a rock-shaft, E,(best shown in Fig. 2) and the levers orlinks Dform i'igidlyprojecting arms on this shaft. The shaft also has adownwardly-projecting arm, E, on which is a wrist-pin, e. r

F designates a bar or rod which extends lengthwise of the press, andwhich has a re ciprocating motion imparted to it by means of cams G G,which act alternately upon the rollersg 9 upon the rod. The cams G G areupon a shaft, G", which has a rotary motion continuously in onedirection.

The rod or bar F is constructed with a notch or gap,f, to form agab-hook which engages with the wrist pin 6 of the rockshaft E. It willtherefore be seen that so long as the gabhookf is in engagement with thewrist-pin e the rock-shaftEwillreceiveatoandfro swinging motion, and thetoggle-levers or links D D will be alternrtely deflected or bent andstraightened in proper time with the recipro- It will also be seen thatif the gab-hook f be lifted off the wrist-pin ethe rocksh aft willreceive no swinging movement and the toggle levers or links D D willremain bent or deflected, as shown in Figs. 1 and 3.

By means of a foot-rod, H, arranged adjacent to the platform on whichthe press-feeder stands, the feeder may raise the gab-hook off thewrist-pin e. In order to accomplish this the rod H is connected with anarm, H, upon the rock-shaft Hfl'and this rock-shaft also has anotherarm, H carrying a roller, h, which is immediately below the rod or barF.

The foot-rod and its connections are raised normally by means of aspring, h,- but when this red is pressed downward the roller h,act-

ing upon the bar or rod F, will raise the gabhookf out of engagementwith the pin e. It is obvious that wit-h this arrangement of parts thepressman may trip the gab-hookf at any time while the bed is moving ineither direction; but if he should so trip the gab-hook while the togglelevers or links D D are straightened or in line the cylinder wouldremain in its lowermost position and breakage of parts would ensue. Toprevent this I have shown upon the under side of the bar or rod F and atthe side of the gab-hook or notch f a pin or projection, f, which isbest shown in Fig. 3. The gab-hook f cannot be raised sufficiently tocarry the abutment or projection f entirely above the wrist-pin e, andhence it will be seen that if the gab-hook is so raised while the rod orbar F is moving in the direc tion indicated by the arrow, Fig. 3, thepin or projection f will come in contact with the wrist-pin e and willbend or deflect the toggle levers or links D D.

What I claim as my invention, and desire to secure by Letters Patent, is

The combination, with the impression-cylinder, and mechanism,substantially as described, for raising and lowering the cylinder, andcomprising the rock-shaft E and its arm provided with a wrist-pin, ofthe cam-actuated bar or rod F, having a gab-hook or notch, f, engagingwith the wrist-pin, and a downward projection or abutment ,f, at theside of the hook or notch, adapted to engage with the wrist-pin when thehook or notch f is raised out of engagement therewith, substantially asherein described.

CALVERT B. COTTBELL.

'Witnesses:

HENRY T. BRowN, FREDK. HAYNES.

